Rose Rock Midstream, L.P. Announces Filing of Its Annual Report on Form 10-K

Rose Rock Midstream, L.P. Announces Filing of Its Annual Report on Form 10-K

TULSA, Okla., April 17, 2013 (GLOBE NEWSWIRE) -- Rose Rock Midstream, L.P.
(NYSE:RRMS) filed on March 1, 2013, its Form 10-K for the year ended December
31, 2012, with the Securities and Exchange Commission.

A copy of the Form 10-K is available to be viewed or downloaded on Rose Rock
Midstream's website at www.rrmidstream.com. Upon request to its Investor
Relations department, Rose Rock Midstream will send a hard copy of its
complete audited financial statements to investors, free of charge.

About Rose Rock Midstream

Rose Rock Midstream, L.P. (NYSE:RRMS) is a growth-oriented Delaware limited
partnership formed by SemGroup® Corporation (NYSE:SEMG) to own, operate,
develop and acquire a diversified portfolio of midstream energy assets. Rose
Rock Midstream provides crude oil gathering, transportation, storage and
marketing services. Headquartered in Tulsa, OK, Rose Rock Midstream has
operations in six states with the majority of its assets strategically located
in or connected to the Cushing, Oklahoma crude oil marketing hub.

CONTACT: Investor Relations:
         Mary Catherine Ward
         918-524-7711
         roserockir@rrmidstream.com
        
         Media:
         Kiley Roberson
         918-524-8594
         kroberson@rrmidstream.com

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